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d'Alembertian



An interesting glyph for the d'Alembert operator (aka quabla) I found in a 
recent issue of << Annales de la Fondation Louis de Broglie >>. It looks 
like a square, but the left and bottom stroke are stronger than the two 
other strokes. This form is used together with \Delta for Laplacian and 
inverted Delta for Nabla.

--J"org Knappen.